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conf, udp: Drop mostly duplicated dns_send arrays, rename related fields

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Given that we use just the first valid DNS resolver address
configured, or read from resolv.conf(5) on the host, to forward DNS
queries to, in case --dns-forward is used, we don't need to duplicate
dns[] to dns_send[]:

- rename dns_send[] back to dns[]: those are the resolvers we
  advertise to the guest/container

- for forwarding purposes, instead of dns[], use a single field (for
  each protocol version): dns_host

- and rename dns_fwd to dns_match, so that it's clear this is the
  address we are matching DNS queries against, to decide if they need
  to be forwarded

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2022-11-10 20:30:03 +01:00
parent 4129764eca
commit 3a2afde87d
6 changed files with 62 additions and 71 deletions

20
passt.h
View file

@ -101,9 +101,9 @@ enum passt_modes {
* @addr_seen: Latest IPv4 address seen as source from tap
* @prefixlen: IPv4 prefix length (netmask)
* @gw: Default IPv4 gateway, network order
* @dns: Host IPv4 DNS addresses, zero-terminated, network order
* @dns_send: Offered IPv4 DNS, zero-terminated, network order
* @dns_fwd: Address forwarded (UDP) to first IPv4 DNS, network order
* @dns: DNS addresses for DHCP, zero-terminated, network order
* @dns_match: Forward DNS query if sent to this address, network order
* @dns_host: Use this DNS on the host for forwarding, network order
*/
struct ip4_ctx {
struct in_addr addr;
@ -111,8 +111,8 @@ struct ip4_ctx {
int prefix_len;
struct in_addr gw;
struct in_addr dns[MAXNS + 1];
struct in_addr dns_send[MAXNS + 1];
struct in_addr dns_fwd;
struct in_addr dns_match;
struct in_addr dns_host;
};
/**
@ -122,9 +122,9 @@ struct ip4_ctx {
* @addr_seen: Latest IPv6 global/site address seen as source from tap
* @addr_ll_seen: Latest IPv6 link-local address seen as source from tap
* @gw: Default IPv6 gateway
* @dns: Host IPv6 DNS addresses, zero-terminated
* @dns_send: Offered IPv6 DNS addresses, zero-terminated
* @dns_fwd: Address forwarded (UDP) to first IPv6 DNS, network order
* @dns: DNS addresses for DHCPv6 and NDP, zero-terminated
* @dns_match: Forward DNS query if sent to this address
* @dns_host: Use this DNS on the host for forwarding
*/
struct ip6_ctx {
struct in6_addr addr;
@ -133,8 +133,8 @@ struct ip6_ctx {
struct in6_addr addr_ll_seen;
struct in6_addr gw;
struct in6_addr dns[MAXNS + 1];
struct in6_addr dns_send[MAXNS + 1];
struct in6_addr dns_fwd;
struct in6_addr dns_match;
struct in6_addr dns_host;
};
#include <netinet/if_ether.h>